{
  "abstract": "The interaction between conjugated molecules and intense electric field pulses drives a plethora of intriguing nonlinear phenomena, including optical limiting. While excited-state absorption was recently identified as the primary mechanism for this effect in thiophene oligomers, open questions remain regarding field-dependent population dynamics under intense laser driving. Using real-time time-dependent density functional theory combined with a determinant-overlap population framework, we track the intensity-dependent nonlinear response of a single thiophene ring (1T) and quaterthiophene (4T) as prototypical members of the oligothiophene family with different length and symmetry. We demonstrate that extended $π$-conjugation in 4T lowers nonlinear excitation thresholds by orders of magnitude compared to 1T. State-resolved population dynamics reveal complete ground-state depletion accompanied by sequential excited-state absorption channels under intense driving. High-harmonic generation spectra explicitly reflect molecular symmetry constraints, while energy-resolved occupation densities confirm continuous orbital redistribution across the $π^*$-manifold. This work provides dynamic physical insights for engineering organic materials with tailored nonlinear optical properties.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.29284",
  "author_total": 3,
  "authors": [
    {
      "name": "Mustapha Driouech"
    },
    {
      "name": "Caterina Cocchi"
    },
    {
      "name": "Michele Guerrini"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dfs2exp6t0zr2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.29284",
  "fulltext_url": null,
  "id": "dfs2exp6t0zr2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.29284",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.chem-ph"
    ],
    [
      "arxiv",
      "physics.comp-ph"
    ],
    [
      "openalex",
      "3107|Laser-Matter Interactions and Applications"
    ]
  ],
  "openalex": "W7214371170",
  "pdf_url": "https://arxiv.org/pdf/2609.29284",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dfs2exp6t0zr2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2609.29284",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.29284"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.comp-ph",
      "subfield": "computational"
    }
  ],
  "title": "Strong-Field-Driven Non-Linear Electron Dynamics in Thiophene Oligomers",
  "title_text": "Strong-Field-Driven Non-Linear Electron Dynamics in Thiophene Oligomers",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/dfs2exp6t0zr2",
  "venue": "arXiv",
  "versions": []
}